Add tests files

tests/get-wp-version.php

@@ -0,0 +1,54 @@
+<?php
+
+$ch = curl_init();
+curl_setopt( $ch, CURLOPT_URL, 'https://api.wordpress.org/core/version-check/1.7/' );
+
+// Set so curl_exec returns the result instead of outputting it.
+curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
+
+// Get the response and close the channel.
+$response = curl_exec( $ch );
+curl_close( $ch );
+
+$versions = json_decode( $response );
+$versions = $versions->offers;
+
+// Sorting available WordPress offers by version number
+function offer_version_sort( $first, $second ) {
+	return version_compare( $first->version, $second->version, '<' );
+}
+
+uasort( $versions, 'offer_version_sort' );
+
+$version_stack = array();
+
+foreach( $versions as $offer ) {
+	list( $major, $minor ) = explode( '.',  $offer->version );
+
+	$base = $major . '.' . $minor;
+
+	if (
+		! isset( $version_stack[ $base ] )
+		|| version_compare( $offer->version, $version_stack[ $base ] ) ) {
+
+		// There is no version like this yet or there is a newer patch to this major version
+		$version_stack[ $base ] = $offer->version;
+	}
+
+	if ( count( $version_stack ) === 2 ) {
+		break;
+	}
+}
+
+$wp_versions = array_values( $version_stack );
+
+if ( empty( $argv[1] ) ) {
+	print $wp_versions[0] . "\n";
+} else if ( '--previous' === $argv[1] ) {
+	print $wp_versions[1] . "\n";
+} else {
+	die(
+		"Unknown argument: " . $argv[1] . "\n"
+		. "Use with no arguments to get the latest stable WordPress version, or use `--previous' to get the previous stable major release.\n"
+	);
+}